EP2509852B1 - Endlosspur für den antrieb eines fahrzeuges mit seitenrissbeständigkeit - Google Patents
Endlosspur für den antrieb eines fahrzeuges mit seitenrissbeständigkeit Download PDFInfo
- Publication number
- EP2509852B1 EP2509852B1 EP10835318.6A EP10835318A EP2509852B1 EP 2509852 B1 EP2509852 B1 EP 2509852B1 EP 10835318 A EP10835318 A EP 10835318A EP 2509852 B1 EP2509852 B1 EP 2509852B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- endless track
- lateral edge
- edge part
- hole
- track
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D55/00—Endless track vehicles
- B62D55/08—Endless track units; Parts thereof
- B62D55/18—Tracks
- B62D55/24—Tracks of continuously flexible type, e.g. rubber belts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D55/00—Endless track vehicles
- B62D55/08—Endless track units; Parts thereof
- B62D55/18—Tracks
- B62D55/24—Tracks of continuously flexible type, e.g. rubber belts
- B62D55/244—Moulded in one piece, with either smooth surfaces or surfaces having projections, e.g. incorporating reinforcing elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D55/00—Endless track vehicles
- B62D55/02—Endless track vehicles with tracks and additional ground wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D55/00—Endless track vehicles
- B62D55/08—Endless track units; Parts thereof
- B62D55/18—Tracks
Definitions
- the invention relates to endless tracks for propelling vehicles operable off-road, such as tracked work vehicles (e.g., construction vehicles, agricultural vehicles, forestry vehicles, etc.).
- tracked work vehicles e.g., construction vehicles, agricultural vehicles, forestry vehicles, etc.
- JP2000233775 shows a track for a vehicle with an elastomeric body extending in width direction provided with an embedded central core piece and a groove in the lengthwise direction of the endless track ground engaging surface.
- US 2004/084962 A1 concerns a track for a vehicle travelling on all terrain, especially those displaying ruts, is formed of an endless longitudinal body displaying a series of longitudinally spaced drive lugs on its inner surface and a series of longitudinally spaced profiles on its outer surface. Each profile displays a height decreasing in value from the center of the body to the outer edge thereof.
- the body is formed of flexible rubber material and is free of conventional transversally extending reinforcing embedded rods thus providing reduced transverse rigidity to the body and allowing the body to curvingly flex when engage in ruts.
- EP 1 506 913 A1 discloses a rubber crawler track having an endless rubber belt-shaped rubber crawler track main body formed of a rubber elastic body, etc. and core metal pieces embedded in the rubber crawler track main body at predetermined intervals in a circumferential direction of the rubber crawler track.
- a high hardness intermediate rubber layer track main body is provided from below at least the ground contacting surface side of an end portion in a length direction (rubber crawler track width direction) of the core metal pieces toward outside the end portion in a width direction of the rubber crawler track.
- the rubber elastic body of the rubber crawler track main body is formed in a multiply layered structure with at least two or more layers.
- EP 1 008 509 A1 disclose an elastic flat tread provided with a core fitted to a link or a core fitted to a metallic plate fitted to a link. End parts of the core in the lengthwise direction are bent toward the side not in contact with the ground.
- US 2003/034690 A1 concerns a elastic crawler shoe comprising a core bar fixed directly or through an iron shoe to crawler belt links, each of which is endlessly coupled, and an elastic body bonded to the core bar so as to cover the core bar, wherein the elastic body has a ground contact face having grooves or incisions.
- EP 2 119 620 A1 discloses a rubber crawler track comprising: an endless belt-shaped rubber resilient body configuring an endless track; a plurality of protrusions provided protruding from the inner peripheral face of the rubber resilient body at uniform intervals along the circumferential direction thereof; and grooves located at the roots of the protrusions and formed in a wheel-passing face that a wheel follows in motion.
- Certain off-road vehicles including work vehicles such as construction vehicles (e.g., loaders, bulldozers, excavators, etc.), agricultural vehicles (e.g., harvesters, combines, tractors, etc.) forestry vehicles (e.g., feller-bunchers, tree chippers, knuckleboom loaders, etc.) and military, vehicles (e.g., combat engineering vehicles (CEVs), etc.), are often equipped with endless tracks that enhance their traction and floatation on soft, low friction and/or uneven grounds (e.g., soil, mud, sand, ice, snow, etc.) on which they operate.
- work vehicles such as construction vehicles (e.g., loaders, bulldozers, excavators, etc.), agricultural vehicles (e.g., harvesters, combines, tractors, etc.) forestry vehicles (e.g., feller-bunchers, tree chippers, knuckleboom loaders, etc.) and military, vehicles (e.g.,
- One type of endless track comprises a body including elastomeric material (e.g., rubber) in which are embedded rigid cores (e.g., metallic cores) that extend transversally to impart transverse rigidity to the track and that guide or otherwise interact with wheels of the vehicle which face the track's inner side.
- elastomeric material e.g., rubber
- embedded rigid cores e.g., metallic cores
- a problem often encountered with this type of endless track is that, when a lateral edge part of the track impacts an obstacle on the ground (e.g., a curb, a sidewalk, a rock, an abrupt change in ground level, etc.), the track may deform in such a way that some of its elastomeric material in its lateral edge part begins to tear. Such tearing of the track's elastomeric material, which is referred to as "edge-cutting", may cause premature deterioration of the track.
- sand, rocks, water and/or other undesirable matter may infiltrate the track through the tear and prematurely deteriorate the track (e.g., by leading to a progressive loss of adhesion between the elastomeric material and the cores and/or other components of the track).
- the tear itself may reach a size that renders the track's performance and/or appearance unacceptable.
- the invention provides an endless track for providing traction to a vehicle according to claim 1.
- Figure 1 shows a work vehicle 10 in accordance with an embodiment of the invention.
- the work vehicle 10 is a construction vehicle designed to perform construction work. More specifically, in this example, the construction vehicle 10 is a loader. In other examples, the construction vehicle 10 may be a bulldozer, a backhoe loader, an excavator, or any other type of construction vehicle.
- the construction vehicle 10 comprises a frame 12 supporting a prime mover 14, a pair of track assemblies 16 1 , 16 2 (which can be referred to as "undercarriages"), and an operator cabin 20, from which an operator can control the construction vehicle 10 to move it on the ground and perform construction work using a working implement 18.
- the prime mover 14 is a source of motive power to move the construction vehicle 10.
- the prime mover 14 may comprise an internal combustion engine and/or one or more other types of motors (e.g., electric motors, etc.) for generating motive power to move the construction vehicle 10.
- the prime mover 14 is in a driving relationship with each of the track assemblies 16 1 , 16 2 . That is, power derived from the primer mover 14 is transmitted to each of the track assemblies 16 1 , 16 2 via a powertrain of the construction vehicle 10.
- the working implement 18 is used to perform construction work.
- the working implement 18 is a dozer blade that can be used to push objects and shove soil, debris or other material.
- the working implement 18 may take on various other forms, such as a backhoe, a bucket, a fork, a grapple, a scraper pan, an auger, a saw, a ripper, a material handling arm, or any other type of construction working implement.
- the operator cabin 20 is where the operator sits and controls the construction vehicle 10. More particularly, the operator cabin 20 comprises a set of controls that allow the operator to steer the construction vehicle 10 on the ground and perform construction work using the working implement 18.
- each track assembly 16 i comprises an endless track 22 disposed around a plurality of wheels, including a drive wheel 24, a front idler wheel 26, a rear idler wheel 29, and a plurality of roller wheels 28 1 -28 10 .
- the drive wheel 24 is rotatable by power derived from the prime mover 14 for imparting movement of the endless track 22 in order to propel the construction vehicle 10 on the ground.
- the idler wheels 26, 29 and the roller wheels 28 1 -28 10 do not convert power supplied by the prime mover 14 to motive force, but rather guide the endless track 22 and/or maintain it under tension as it is driven by the drive wheel 24.
- the roller wheels 28 1 -28 10 roll on a bottom run of the endless track 22 to apply it on the ground for traction.
- the endless track 22 provides traction to the construction vehicle 10.
- the endless track 22 comprises an inner side 25, a ground-engaging outer side 27, a first lateral edge 31 1 , and a second lateral edge 31 2 .
- the inner side 25 faces the wheels 24, 26, 29, 28 1 -28 10 and defines an inner area of the track assembly 16 i in which these wheels rotate.
- the ground-engaging outer side 27 engages the ground for traction of the construction vehicle 10.
- the endless track 22 has a length defining a longitudinal axis 45 and a width defined by its lateral edges 31 1 , 31 2 .
- the endless track 22 thus has a longitudinal direction (i.e., a direction generally parallel to the longitudinal axis 45) and transversal directions (i.e., directions transverse to the longitudinal axis 45), including a widthwise direction (i.e., a lateral direction generally perpendicular to the longitudinal axis 45).
- the endless track 22 also has a thickness which defines a thickness direction thereof.
- the inner side 25 of the endless track 22 contacts the wheels 24, 26, 29, 28 1 -28 10 as the track 22 is in motion around these wheels. Motion of the endless track 22 is imparted by the drive wheel 24. More particularly, in this embodiment, the drive wheel 24 is a drive sprocket and the endless track 22 has a plurality of openings 33 1 -33 N which cooperate with teeth of the drive wheel 24 in order to drive the endless track 22. As it is driven, the endless track 22 contacts the idler wheels 26, 29 and the roller wheels 28 1 -28 10 which help guide the track 22 and maintain it under tension.
- the inner side 25 comprises rolling surfaces 30 1 , 30 2 on which the roller wheels 28 1 -28 10 roll to apply the track 22 onto the ground.
- the ground-engaging outer side 27 comprises a tread 40 to enhance traction on the ground.
- the tread 40 comprises a plurality of traction projections 68 1 -68 T distributed on the ground-engaging outer side 27 for enhancing traction on the ground.
- the tread 40 may have any suitable configuration.
- the endless track 22 comprises an elastomeric body 36 underlying the inner side 25 and the ground-engaging outer side 27.
- the elastomeric body 36 will be referred to as a "carcass".
- the carcass 36 is elastomeric in that it comprises elastomeric material 38.
- a plurality of cores 44 1 -44 N are at least partially embedded in the elastomeric material 38.
- a layer of reinforcing cables 37 1 -37 M is embedded in the elastomeric material 38.
- the carcass 36 may comprise one or more additional and/or different components, such as one or more other reinforcements (e.g., one or more layers of reinforcing fabrics), embedded in the elastomeric material 38, in other embodiments.
- the elastomeric material 38 allows the carcass 36 to elastically change in shape as the endless track 22 is in motion around the wheels 24, 26, 29, 28 1 -28 10 .
- the elastomeric material 38 can be any polymeric material with the property of elasticity.
- the elastomeric material 38 includes rubber.
- Various rubber compounds may be used and, in some cases, different rubber compounds may be present in different areas of the carcass 36.
- the elastomeric material 38 may include another elastomer in addition to or instead of rubber (e.g., polyurethane elastomer).
- each of the reinforcing cables 37 1 -37 M extend generally parallel to one another and in the longitudinal direction of the endless track 22 to enhance strength in tension of the track 22 along its longitudinal direction.
- each of the reinforcing cables 37 1 -37 M is a cord or wire rope including a plurality of strands or wires.
- each of the reinforcing cables 37 1 -37 M may be another type of cable and may be made of any suitable material (e.g., metal, plastic, or composite material).
- the cores 44 1 -44 N are distributed along and extend transversally to the longitudinal direction of the endless track 22 to impart transverse rigidity to the endless track 22.
- the cores 44 1 -44 N also help to guide some of the wheels 24, 26, 29, 28 1 -28 10 as the endless track 22 is driven by the drive wheel 24.
- Each core 44 i has a longitudinal axis extending transversally (in this case, perpendicularly) to the longitudinal axis 45 of the endless track 22.
- the core 44 i has a length which is shorter than the width of the endless track 22 such that it has a first longitudinal end 48 1 and a second longitudinal end 48 2 that are spaced apart from the lateral edges 31 1 , 31 2 of the endless track 22. That is, the first longitudinal end 48 1 of the core 44 i is spaced apart from the first lateral edge 31 1 of the endless track 22 along the track's widthwise direction, and the second longitudinal end 48 2 of the core 44 i is spaced apart from the second lateral edge 31 2 of the endless track 22 along the track's widthwise direction.
- each core 44 i comprises a pair of wings 50 1 , 50 2 and a wheel guide 52.
- the wings 50 1 , 50 2 are elongated along the longitudinal axis of the core 44 i to impart transverse rigidity to the endless track 22.
- Each of the wings 50 1 , 50 2 has a top surface oriented towards the inner side 25 of the endless track 22 and a bottom surface oriented towards the ground-engaging outer side 27 of the endless track 22.
- each of the wings 50 1 , 50 2 has a tapered shape whereby its top surface converges longitudinally outwardly towards its bottom surface.
- the wings 50 1 , 50 2 may have various other shapes in other embodiments.
- the wheel guide 52 serves to guide some of the wheels 24, 26, 29, 28 1 -28 10 as the endless track 22 is driven by the drive wheel 24. More particularly, in this embodiment, the wheel guide 52 comprises a pair of guide projections 56 1 , 56 2 that project on the inner side 25 of the endless track 22. Each guide projection 56 i comprises a top end, a base, and a pair of wheel-facing sides opposite one another and extending from its base to its top end.
- the wheel guide 52 may be configured in various other ways in other embodiments (e.g., it may comprise only one guide projection or more than two (2) guide projections).
- the core 44 i is made of metal (e.g., steel) formed into shape by casting.
- the core 44 i may have various other shapes, may comprise various other components, may be made of various other rigid materials (e.g., polymers, ceramics, composites, etc.), and/or may be made using various other processes (e.g., forging, welding, fastening, etc.) in other embodiments.
- the endless track 22 comprises a central part 62 between a first lateral edge part 63 1 and a second lateral edge part 63 2 .
- the central part 62 is located between the longitudinal ends 48 1 , 48 2 of the cores 44 1 -44 N .
- the first lateral edge part 63 1 is located between the first lateral edge 31 1 and the cores 44 1 -44 N (i.e., between the first lateral edge 31 1 and the first longitudinal ends 48 1 of the cores 44 1 -44 N ).
- the second lateral edge part 63 2 is located between the second lateral edge 31 2 and the cores 44 1 -44 N (i.e., between the second lateral edge 31 2 and the second longitudinal ends 48 2 of the cores 44 1 -44 N ).
- a lateral edge part 63 i of the endless track 22 may impact (i.e., make contact with) an obstacle on the ground (e.g., a curb, a sidewalk, a rock, an abrupt change in ground level, etc.).
- an obstacle on the ground e.g., a curb, a sidewalk, a rock, an abrupt change in ground level, etc.
- the first lateral edge part 63 1 comprises a first impact absorber 70 1 and the second lateral edge part 63 2 comprises a second impact absorber 70 2 .
- the first impact absorber 70 1 will be described in further detail, with an understanding that a similar description applies to the second impact absorber 70 2 .
- the impact absorber 70 1 is a shield (i.e., a protective element) that protects the lateral edge part 63 1 of the endless track 22 against wear due to an impact with an obstacle on the ground.
- the impact absorber 70 1 protects the lateral edge part 63 1 of the endless track 22 against edge-cutting. That is, the impact absorber 70 1 makes the lateral edge part 63 1 more resistant (i.e., less susceptible) to edge-cutting than if the endless track 22 lacked the impact absorber 70 1 but was otherwise identical.
- the impact absorber 70 1 is located between the lateral edge 31 1 and the cores 44 1 -44 N to facilitate an elastic deformation of the lateral edge part 63 1 when the lateral edge part 63 1 impacts an obstacle on the ground.
- the impact absorber 70 1 facilitates an elastic deformation of a portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N when the lateral edge part 63 1 impacts an obstacle on the ground.
- the elastic deformation of the portion 51 of the rubber 38 protects against tearing of the portion 51 of the rubber 38.
- the impact absorber 70 1 protects the portion 51 of the rubber 38 against tearing in that it makes the portion 51 of the rubber 38 more resistant (i.e., less susceptible) to tearing when the lateral edge part 63 1 impacts an obstacle on the ground than if the endless track 22 lacked the impact absorber 70 1 but was otherwise identical.
- the impact absorber 70 1 can be viewed as constituting an anti-tear zone opposing development of a tear of the portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N when the lateral edge part 63 1 impacts an obstacle on the ground.
- the impact absorber 70 1 may oppose development of a tear of the portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N by preventing such a tear from arising.
- the impact absorber 70 1 may not necessarily be able to prevent a tear of the portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N from arising, but nevertheless opposes development of the tear.
- the impact absorber 70 1 may cause the tear to appear after a longer period of time than if the endless track 22 lacked the impact absorber 70 1 but was otherwise identical.
- the impact absorber 70 1 may cause a growth rate of the tear to be slower than if the endless track 22 lacked the impact absorber 70 1 but was otherwise identical.
- the impact absorber 70 1 may cause a size of the tear to be smaller after a given period of time than if the endless track 22 lacked the impact absorber 70 1 but was otherwise identical.
- testing can be conducted on the endless track 22 and a reference endless track that lacks the impact absorber 70 1 but is otherwise identical to the endless track 22.
- the impact absorber 70 1 reduces a level of stress in the portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N when the lateral edge part 63 1 impacts an obstacle on the ground. That is, when the lateral edge part 63 1 impacts an obstacle on the ground, the impact absorber 70 1 causes the portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N to experience a level of stress lower than that which would be experienced by the portion 51 of the rubber 38 if the endless track 22 lacked the impact absorber 70 1 but was otherwise identical. In that sense, the impact absorber 70 1 can be viewed as a form of stress relief in this case.
- the impact absorber 70 1 may be configured in various ways in various embodiments.
- the impact absorber 70 1 comprises a plurality of holes 72 1 -72 M distributed along the longitudinal direction of the endless track 22.
- Each hole 72 i is an internal space unfilled by the portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N and delimited by an internal surface 73 i of the portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N .
- the hole 72 i is an open cavity (i.e., a cavity open at a periphery of the track 22).
- the hole 72 i may be a closed cavity (i.e., a cavity which does not extend to the periphery of the track 22).
- the holes 72 1 -72 M reduces a level of stress in the portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N when the lateral edge part 63 1 impacts an obstacle on the ground (i.e., the portion 51 of the rubber 38 experiences a level of stress lower than that which it would experience if the endless track 22 lacked the holes 72 1 -72 M but was otherwise identical).
- the holes 72 1 -72 M may be configured in various ways in order to provide a tear protection effect.
- each hole 72 i may extend in various manners in the lateral edge part 63 1 of the endless track 22.
- each hole 72 i extends inwardly from the inner side 25 of the endless track 22.
- each hole 72 i may extend inwardly from the ground-engaging outer side 27 of the endless track 22, may extend inwardly from the lateral edge 31 1 of the endless track 22, or may be a closed cavity that does not extend to the periphery of the endless track 22.
- each hole 72 i has a generally triangular shape (when viewed from the inner side 25 of the track 22) that tapers in the thickness direction of the endless track 22.
- Each hole 72 i may have any other suitable shape in other embodiments.
- different ones of the holes 72 1 -72 M may be shaped differently in some embodiments.
- the holes 72 1 -72 M may have various dimensions.
- the hole 72 i has a dimension D 1 measured along the thickness direction of the endless track 22 (in this embodiment, the dimension D 1 is a depth).
- the dimension D 1 may take on various values.
- the dimension D 1 may be at least 5%, in some cases at least 10%, in some cases at least 15%, in some cases at least 20%, in some cases at least 25%, and in some cases at least 30% of a thickness T e of the lateral edge part 63 1 .
- the hole 72 i has a dimension D 2 measured along the widthwise direction of the endless track 22.
- the dimension D 2 may take on various values.
- the dimension D 2 may be at least 5%, in some cases at least 10%, in some cases at least 15%, in some cases at least 20%, in some cases at least 25%, and in some cases at least 30% of a width W e of the lateral edge part 63 1 .
- the holes 72 1 -72 M may be distributed in various manners along the longitudinal direction of the endless track 22. In this embodiment, the holes 72 1 -72 M are distributed such that there is at least one (1) hole, in this case two (2) holes, aligned with each of the cores 44 1 -44 N . In other embodiments, the holes 72 1 -72 M may be distributed such that one or more holes are not aligned with any of the cores 44 1 -44 N .
- the holes 72 1 -72 M may be provided in the endless track 22 in various ways.
- the holes 72 1 -72 M may be molded during molding of the endless track 22.
- the holes 72 1 -72 M may be machined (e.g., drilled, reamed, carved) into the endless track 22 after it has been molded.
- each hole 72 i that is located in a segment of the endless track 22 which contacts the obstacle facilitates an elastic deformation of the portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N .
- the hole 72 i is deformable (i.e., changeable in shape), in this case shrinkable, to facilitate the elastic deformation of the portion 51 of the rubber 38.
- the portion 51 of the rubber 38 thus elastically deforms in such a way that it causes the hole 72 i to at least partially close.
- the hole 72 i acts as an air cushion to absorb energy when the lateral edge part 63 1 of the endless track 22 impacts an obstacle on the ground.
- the hole 72 i directs the elastic deformation of the portion 51 of the rubber 38. More particularly, the hole 72 i provides a void which offers a path of least resistance to the elastic deformation of the portion 51 of the rubber 38. As such, a part 75 of the rubber 38 between the hole 72 i and the lateral edge 31 1 moves towards a part 76 of the rubber 38 between the hole 72 i and the cores 44 1 -44 N . Thus, the hole 72 i collapses as opposing areas of the internal surface 73 i defining the hole 72 i move towards one another.
- the hole 72 i reduces the level of stress in the portion 51 of the rubber 38 by facilitating movement of different parts of the portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N . Also, the hole 72 i reduces a likelihood of the part 76 of the rubber 38 between the hole 72 i and the cores 44 1 -44 N being sheared against the cores 44 1 -44 N . By relieving stress in the portion 51 of the rubber 38, the hole 72 i protects against tearing of the portion 51 of the rubber 38.
- the holes 72 1 -72 M may be configured in various other ways in other embodiments, as mentioned above.
- Figures 7 to 20 show examples of different configurations of holes such as the holes 72 1 -72 M in other embodiments. More particularly:
- the impact absorber 70 1 may have any number of holes such as the holes 72 1 -72 M .
- the impact absorber 70 1 may have a single hole such as the holes 72 1 -72 M .
- Figures 21 and 22 show an embodiment in which the impact absorber 70 1 has a single hole 1072 configured as a groove which runs along a majority (e.g., an entirety) of the length of the endless track 22.
- Figures 23 and 24 shows an embodiment in which the impact absorber 70 1 has a single hole 1172 configured as a closed channel which runs along a majority (e.g., an entirety) of the length of the endless track 22.
- the hole 1172 may be provided, for instance, by leaving an opening in one or more sheets of rubber that are positioned in a mold in which the endless track 22 is molded such that, after molding, this opening forms the hole 1172.
- each hole 72 i may contain a filler, which includes something (other than air) that fills all or less than all of the hole 72 i and that facilitates the elastic deformation of the portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N when the lateral edge part 63 1 impacts an obstacle on the ground.
- a filler which includes something (other than air) that fills all or less than all of the hole 72 i and that facilitates the elastic deformation of the portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N when the lateral edge part 63 1 impacts an obstacle on the ground.
- a hole 872 i , 972 i may contain a filler 80 which is a solid material (i.e., material neither liquid nor gaseous).
- the filler 80 may include an elastomer (e.g., a foam rubber or another soft rubber, a polyurethane foam, etc.) or some other elastic material and may fill all or less than all of the hole 872 i , 972 i .
- the filler 80 may be provided in the endless track 22 in various ways. For instance, in some cases, the filler 80 may be provided by molding it in the hole 872 i , 972 i during molding of the endless track 22. In other cases, the filler 80 may be provided by affixing it in the hole 872 i , 972 i using a suitable adhesive.
- the filler 80 may be more elastic (i.e., have a greater elasticity) than the portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N .
- the filler 80 may have a modulus of elasticity lower than a modulus of elasticity of the portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N .
- the filler 80 may have a modulus of elasticity that is at least 10%, in some cases at least 20%, in some cases at least 30%, in some cases at least 40%, and in some cases at least 50% lower than that of the portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N .
- a ratio of the modulus of elasticity of the filler 80 to the modulus of elasticity of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N may be no more than 0.9, in some cases no more than 0.8, in some cases no more than 0.7, in some cases no more than 0.6, and in some cases no more than 0.5.
- the modulus of elasticity of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N can be taken as an average of these different moduli of elasticity (e.g., a weighted average of these different moduli of elasticity based on the weight of each rubber compound and the total weight of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N ).
- the modulus of elasticity of the filler 80 can be taken as an average of these different moduli of elasticity (e.g., a weighted average of these different moduli of elasticity based on the weight of each compound and the total weight of the filler 80).
- the filler 80 may have a hardness (e.g., a durometer or other suitable hardness measure) lower than a hardness of the portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N .
- the filler 80 may have a hardness (e.g., a durometer) that is at least 10%, in some cases at least 20%, in some cases at least 30%, in some cases at least 40%, and in some cases at least 50% lower than that of the portion 51 of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N .
- a ratio of the hardness of the filler 80 to the hardness of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N may be no more than 0.9, in some cases no more than 0.8, in some cases no more than 0.7, in some cases no more than 0.6, and in some cases no more than 0.5.
- the hardness of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N can be taken as an average of these different hardness values (e.g., a weighted average of these hardness values based on the weight of each rubber compound and the total weight of the rubber 38 between the lateral edge 31 1 and the cores 44 1 -44 N ).
- the modulus of elasticity of the filler 80 can be taken as an average of these different hardness values (e.g., a weighted average of these different hardness values based on the weight of each compound and the total weight of the filler 80).
- a hole 1272 i may contain a filler 81 which is a fluid (i.e., a liquid or gas).
- the filler 81 may include a gas (e.g., air or another gas) or a liquid (e.g., water, oil or another liquid) and may fill all or less than all of the hole 1272 i .
- the filler 80 may be provided in the endless track 22 in various ways. For instance, in some cases, the filler 81 may be contained in a capsule, pouch or other container that is provided in the track 22 by placing it, before molding of the track 22, between layers of the rubber 38 where the hole 1272 i is to be formed. In other cases, the filler 80 may be provided in the track 22 by injecting it into the hole 1272 i during or after molding of the track 22.
- the filler 80 is confined in the endless track 22 in that it cannot flow out of its confines within the hole 1272 i . This is in contrast to embodiments discussed above in which ambient air can freely flow in and out of open cavities such as the holes 72 1 -72 M .
- the filler 80 may be confined in the endless track 22 in various ways. For instance, in this embodiment, the hole 1272 i which contains the filler 81 is a closed cavity.
- a hole containing the filler 81 may be an open cavity (e.g., the hole 872 i ) in which case the filler 81 is sealed in the open cavity (e.g., by being contained in a capsule, pouch or other container affixed to the open cavity's internal surface using a suitable adhesive, or by closing off the open cavity's opening with a membrane or other suitable closure).
- the impact absorber 70 1 comprises one or more holes such as the holes 72 1 -72 M
- the impact absorber 70 1 may not comprise any hole but still facilitate an elastic deformation of the lateral edge part 63 1 of the endless track 22 when the lateral edge part 63 1 impacts an obstacle on the ground.
- the impact absorber 70 1 may comprise a plurality of slits 85 1 -85 3 formed during manufacturing of the endless track 22 (e.g., by cutting).
- the slits 85 1 -85 3 extend inwardly from the inner side 25 of the track 22.
- the slits 85 1 -85 3 may extend inwardly from the ground-engaging outer side 27 of the track 22 or from the lateral edge 31 1 of the track 22.
- the impact absorber 70 1 comprises three slits 85 1 -85 3
- the impact absorber 70 1 may comprise any number of slits (e.g., a single slit, two slits, or more than three slits) such as the slits 85 1 -85 3 .
- the impact absorber 70 1 may comprise an elastic material 89 which is different from the rubber 38 of the central part 62 of the endless track 22 in which the cores 44 1 -44 N are embedded.
- the elastic material 89 may include an elastomer (e.g., a foam rubber or another rubber, a polyurethane foam) or some other elastic substance.
- the elastic material 89 may be provided in the endless track 22 in various ways. For instance, in some cases, the elastic material 89 may be provided by molding it with the rubber 38 of the track 22 during molding of the track 22. In other cases, the elastic material 89 may be provided by affixing it to the rubber 38 of the track 22 using a suitable adhesive.
- the elastic material 89 may be more elastic (i.e., have a greater elasticity) than the rubber 38 of the central part 62 of the endless track 22.
- the elastic material 89 may have a modulus of elasticity lower than a modulus of elasticity of the rubber 38 of the central part 62 of the endless track 22.
- the elastic material 89 may have a modulus of elasticity that is at least 10%, in some cases at least 20%, in some cases at least 30%, in some cases at least 40%, and in some cases at least 50% lower than that of the rubber 38 of the central part 62 of the endless track 22.
- a ratio of the modulus of elasticity of the elastic material 89 to the modulus of elasticity of the rubber 38 of the central part 62 of the endless track 22 may be no more than 0.9, in some cases no more than 0.8, in some cases no more than 0.7, in some cases no more than 0.6, and in some cases no more than 0.5.
- the modulus of elasticity of the rubber 38 of the central part 62 of the endless track 22 can be taken as an average of these different moduli of elasticity (e.g., a weighted average of these different moduli of elasticity based on the weight of each rubber compound and the total weight of the rubber 38 of the central part 62 of the endless track 22).
- the modulus of elasticity of the elastic material 89 can be taken as an average of these different moduli of elasticity (e.g., a weighted average of these different moduli of elasticity based on the weight of each compound and the total weight of the elastic material 89).
- the elastic material 89 may have a hardness (e.g., a durometer or other suitable hardness measure) lower than a hardness of the rubber 38 of the central part 62 of the endless track 22.
- the elastic material 89 may have a hardness (e.g., a durometer) that is at least 10%, in some cases at least 20%, in some cases at least 30%, in some cases at least 40%, and in some cases at least 50% lower than that of the rubber 38 of the central part 62 of the endless track 22.
- a ratio of the hardness of the elastic material 89 to the hardness of the rubber 38 of the central part 62 of the endless track 22 may be no more than 0.9, in some cases no more than 0.8, in some cases no more than 0.7, in some cases no more than 0.6, and in some cases no more than 0.5.
- the hardness of the rubber 38 of the central part 62 of the endless track 22 can be taken as an average of these different hardness values (e.g., a weighted average of these hardness values based on the weight of each rubber compound and the total weight of the rubber 38 of the central part 62 of the endless track 22).
- the modulus of elasticity of the elastic material 89 can be taken as an average of these different hardness values (e.g., a weighted average of these different hardness values based on the weight of each compound and the total weight of the elastic material 89).
- the elastic material 89 extends inwardly from the lateral edge 31 1 for a certain portion (e.g., about 80%) of the width W e of the lateral edge part 63 1 and from the inner side 25 for a certain portion (e.g., about 75%) of the thickness T e of the lateral edge part 63 1 .
- the elastic material 89 may extend inwardly from the lateral edge 31 1 for another portion (e.g., about 40%, 50% or 60%) or all of the width W e of the lateral edge part 63 1 and/or from the inner side 25 for another portion (e.g., about 40%, 50% or 60%) or all of the thickness T e of the lateral edge part 63 1 .
- the elastic material 89 may be provided in the endless track 22 during molding of the endless track 22, or after molding of the endless track (e.g., by affixing it using a suitable adhesive).
- the endless track 22 comprises the impact absorber 70 1 in its first lateral edge part 63 1 and the impact absorber 70 2 in its second lateral edge part 63 2
- the endless track 22 may comprise only one of these impact absorber 70 1 , 70 2 , for instance, on a given one of its lateral edge parts 63 1 , 63 2 that is more susceptible to impact an obstacle on the ground during use (e.g., the lateral edge part furthest away from a center of the vehicle 10).
- each track assembly 16 i of the construction vehicle 10, including its endless track 22, may be configured in various other ways in other embodiments.
- the endless track 22 may interact with the drive wheel 24 in other ways in other embodiments in order to be moved.
- the inner side 25 of the endless track 22 may comprise a plurality of drive lugs that interact with the drive wheel 24 in order to cause the endless track 22 to be driven (i.e., the track assembly 16 i may implement a "positive drive” system), or may frictionally engage the drive wheel 24 to cause the endless track 22 to be driven (i.e., the track assembly 16 i may implement a "friction drive” system).
- Each track assembly 16 i may comprise different and/or additional components in other embodiments.
- the track assembly 16 i may comprise a front drive wheel (e.g., the idler wheel 26 may be replaced by a drive wheel) instead of or in addition to the drive wheel 24.
- the track assembly 16 i may comprise more or less roller wheels such as the roller wheels 28 1 -28 10 .
- the track assembly 16 i may have various other configurations (e.g., a generally linear configuration).
- the off-road vehicle 10 is a construction vehicle for performing construction work
- the off-road vehicle 10 may be an agricultural vehicle (e.g., a tractor, a combine harvester, another type of harvester, etc.) for performing agricultural work
- a forestry vehicle e.g., a feller-buncher, a tree chipper, a knuckleboom loader, etc.
- a military vehicle e.g., a combat engineering vehicle (CEV), etc.
- a transporter vehicle e.g., a heavy hauler, a flatbed truck, a trailer, a carrier, etc. for transporting equipment, materials, cargo or other objects, or any other vehicle operable off paved roads.
- an off-road vehicle may also be operable on paved roads in some cases.
- the off-road vehicle 10 may be an unmanned ground vehicle (e.g., a tele-operated or autonomous unmanned ground vehicle).
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- Engineering & Computer Science (AREA)
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- Vibration Dampers (AREA)
Claims (20)
- Endlosgleiskette (22) zur Bereitstellung einer Traktion für ein Fahrzeug (10), wobei die Endlosgleiskette (22) Folgendes umfasst: eine Innenseite (25) um einer Vielzahl von Rädern (24, 26, 29, 281 - 2810) des Fahrzeugs (10) gegenüber zu liegen; eine Boden-eingreifende Außenseite (27), um den Boden einzugreifen; eine erste Seitenkante (311); und eine zweite Seitenkante (312), wobei die Endlosgleiskette (22) Folgendes umfasst:- einen elastomeren Körper (36);- Eine Vielzahl von Kernen (441 - 44N), die mindestens teilweise im elastomeren Körper (36) eingebettet sind, wobei sich jeder Kern (44) quer zur Längsrichtung der Endlosgleiskette (22) erstreckt, um der Endlosgleiskette (22) eine Quersteifigkeit (22) zu verleihen,- ein Bohrung (72i) in einem Seitenkantenteil (63) der Endlosgleiskette (22), wobei der Seitenkantenteil (63) zwischen den Kernen (441 - 44N) und einer bestimmten der ersten Seitenkante (311) und der zweiten Seitenkante (312) angeordnet ist, wobei die Bohrung (72i) verformbar ist, wenn der Seitenkantenteil (63) auf ein Hindernis auf dem Boden auftrifft, wobei sich die Bohrung (72i) von der Innenseite (25) nach innen erstreckt oder sich von der bestimmten der ersten Seitenkante (311) und der zweiten Seitenkante (312) nach innen erstreckt oder einen geschlossenen Hohlraum bildet, der sich nicht in einen Umfang der Endlosgleiskette (22) erstreckt.
- Endlosgleiskette (22) nach Anspruch 1, wobei die Bohrung (72i) schrumpfbar ist, wenn der Seitenkantenteil (63) auf ein Hindernis auf dem Boden auftrifft.
- Endlosgleiskette (22) nach einem der Ansprüche 1 und 2, wobei die Bohrung (72) eine elastische Verformung des Seitenkantenteils (631) leitet, wenn der Seitenkantenteil (63i) auf ein Hindernis auf dem Boden auftrifft.
- Endlosgleiskette (22) nach einem der Ansprüche 1 bis 3, wobei sich die Bohrung (72i) von der Innenseite (25) nach innen erstreckt.
- Endlosgleiskette (22) nach einem der Ansprüche 1 bis 4, wobei die Bohrung (72i) eine einer Vielzahl von Bohrungen (721 - 72M) des ersten Seitenkantenteils (631) ist, wobei die Bohrungen (721 - - 72M) gemäß der Längsrichtung der Endlosgleiskette (22) verteilt sind.
- Endlosgleiskette (22) nach einem der Ansprüche 1 bis 4, wobei der Seitenkantenteil (631) ein erster Seitenkantenteil (631) ist aund die bestimmte der ersten Seitenkante (311) und der zweiten Seitenkante (312) die erste Seitenkante (311) ist, wobei die Endlosgleiskette (22) eine Bohrung (72i) in einem zweiten Seitenkantenteil (632) der Endlosgleiskette (22) umfasst, wobei der Seitenkantenteil (632) zwischen den Kernen (441 - 44N) und der zweiten Seitenkante (312) angeordnet ist, wobei die Bohrung (72i) des zweiten Seitenkantenteils (632) verformbar ist, wenn der zweite Seitenkantenteil (632) auf ein Hindernis auf dem Boden auftrifft, wobei sich die Bohrung (72i) des zweiten Seitenkantenteils (632) von der Innenseite (25) nach innen erstreckt oder sich von der zweiten Seitenkante (312) nach innen erstreckt oder einen geschlossenen Hohlraum bildet, der sich nicht in den Umfang der Endlosgleiskette (22) erstreckt.
- Endlosgleiskette (22) nach Anspruch 6, wobei sich jede der Bohrung (72i) des ersten Seitenkantenteils (631) und der Bohrung (72i) des zweiten Seitenkantenteils (632) von der Innenseite (25) nach innen erstreckt.
- Endlosgleiskette (22) nach einem der Ansprüche 6 und 7, wobei die Bohrung (72i) des ersten Seitenkantenteils (631) eine einer Vielzahl von Bohrungen (721 - 72M) des ersten Seitenkantenteils (631) ist wobei die Bohrungen (721 - 72M) des ersten Seitenkantenteils (631) gemäß der Längsrichtung der Endlosgleiskette (22) verteilt sind, wobei die Bohrung (72i) des zweiten Seitenkantenteils (632) eine einer Vielzahl von Bohrungen (721 - 72M) des zweiten Seitenkantenteils (632) ist, wobei die Bohrungen (721 - 72M) des zweiten Seitenkantenteils (632) gemäß der Längsrichtung der Endlosgleiskette (22) verteilt sind.
- Endlosgleiskette nach einem der Ansprüche 1 bis 8, wobei jeder Kern (44i) ein Paar Flügel (501, 502) und eine Radführung (52) umfasst, wobei die Radführung (52) mindestens einen Vorsprung (56i) auf der Innenseite (25) umfasst.
- Endlosgleiskette (22) nach einem der Ansprüche 1 bis 5, wobei die Bohrung (72i) eine Abmessung (D1) aufweist, die gemäß einer Richtung der Dicke der Endlosgleiskette (22) gemessen wird, die mindestens 10 % einer Dicke des Seitenkantenteils (63i) beträgt.
- Endlosgleiskette (22) nach einem der Ansprüche 1 bis 5 und 10, wobei die Bohrung (72i) eine Abmessung (D2) aufweist, die gemäß einer Richtung der Breite der Endlosgleiskette (22) gemessen wird, die mindestens 5 % einer Breite des Seitenkantenteils (63i) beträgt.
- Endlosgleiskette (22) nach einem der Ansprüche 5 bis 9, wobei Entsprechende der Bohrungen (721 - 72M) mit den Entsprechenden der Kerne (44i) gemäß der Längsrichtung der Endlosgleiskette (22) ausgefluchtet sind.
- Endlosgleiskette (22) nach Anspruch 4, wobei die Bohrung (72i) von einem elastomeren Material des Seitenkantenteils (63i) begrenzt ist, wobei die Bohrung (72i) einen Füllstoff (80) enthält, der Material umfasst, das verschieden vom elastomeren Material des Seitenkantenteils (63i) ist.
- Endlosgleiskette (22) nach Anspruch 13, wobei der Füllstoff (80) ein Elastizitätsmodul aufweist, das kleiner als das Elastizitätsmodul des elastomeren Materials des Seitenkantenteils (63i) ist.
- Endlosgleiskette (22) nach einem der Ansprüche 13 und 14, wobei der Füllstoff (80) ein Elastomer umfasst.
- Endlosgleiskette (22) nach einem der Ansprüche 13 bis 15, wobei der Füllstoff (80) eine Härte aufweist, die geringer als die Härte des elastomeren Materials des Seitenkantenteils (63i) ist.
- Endlosgleiskette (22) nach Anspruch 1, wobei die Bohrung (72) ein Fluid (80) enthält, das in der Endlosgleiskette (22) eingeschlossen ist.
- Endlosgleiskette (22) nach Anspruch 1, wobei die Bohrung im Allgemeinen eine dreieckige Form aufweist.
- Endlosgleiskette (22) nach Anspruch 1, wobei die Bohrung (72i) eine längliche Form aufweist, die gemäß der Längsrichtung der Endlosgleiskette (22) verlängert ist.
- Endlosgleiskette (22) nach Anspruch 1, wobei die Endlosgleiskette eine Länge aufweist und die Bohrung (72i) eine Nut (1072) ist, die entlang eines größten Teils der Länge der Endlosgleiskette (22) verläuft.
Applications Claiming Priority (2)
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KR1020090123208A KR101146092B1 (ko) | 2009-12-11 | 2009-12-11 | 충격흡수 홈을 구성한 고무 크로라 |
PCT/CA2010/000632 WO2011069233A1 (en) | 2009-12-11 | 2010-04-22 | Endless track for propelling a vehicle, with edge-cutting resistance |
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EP2509852A4 EP2509852A4 (de) | 2013-10-16 |
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2010
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- 2010-04-22 US US13/515,175 patent/US9511805B2/en active Active
- 2010-04-22 EP EP10835318.6A patent/EP2509852B1/de active Active
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Also Published As
Publication number | Publication date |
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KR20110066521A (ko) | 2011-06-17 |
US20130162016A1 (en) | 2013-06-27 |
WO2011069233A1 (en) | 2011-06-16 |
US9511805B2 (en) | 2016-12-06 |
EP2509852A4 (de) | 2013-10-16 |
EP2509852A1 (de) | 2012-10-17 |
KR101146092B1 (ko) | 2012-05-15 |
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